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BL654 UART question

Looking for advice on reading data from the BL654 UART RX pin which is getting a text data stream from an STM32 micro. 

I tried the "peripheral_uart" sample app in Segger Studio but it crashes a lot and sometimes I see UART events but have not seen any actual data yet.

Should I use UART IRQ API?  Or UART FIFO API? Should I be using the Nordic UART system CONFIG_BT_NUS like the peripheral_uart example?

I have verified data is working using a terminal to read the serial port.  I have verified the pin assignments and baud rate for the zephyr board DTS file.

Thanks.

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